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The v1.15.11b experiment confirmed setup-buildx-action@v4.1.0 is NOT the regressor: pinning all 9 references to @v4.0.0 reproduced the exact same '400 Bad request' from registry-1.docker.io on the first layer-blob PUT. CI run #336 failed twice (original + Gitea auto-rerun), both with HTML 400 bodies (CDN-tier rejection) at Offset:0. UUIDs and _state signatures differ across attempts; only the failure pattern is stable. Reverting all 9 pins back to @v4 — keeping a wrong pin holds us off action improvements with no benefit. Real suspects now narrow to: runner-image (catthehacker:act-latest, floating), runner-2 host network egress, buildx 0.34.x signed _state token format, or per-repo Hub-side state. Investigation deferred; this release ships via manual docker buildx build --push from a developer Orbstack to bypass the broken runner-network → Hub-CDN combo (we know that path works in ~25s for the same multi-arch build to the same Hub account). PI_VERSION=latest resolves to pi-coding-agent 0.76.0 (published 2026-05-27 20:03 UTC). OPENCODE_VERSION stays at 1.15.11 (no upstream bump since 1.15.11 was published 2026-05-27 03:59 UTC). Files: - .gitea/workflows/docker-publish-split.yml: 9 setup-buildx-action references reverted from @v4.0.0 to @v4 - CHANGELOG.md: v1.15.12 entry with regression triage status (ruled-out vs still-suspect)